(618c) Analysis of Direct Air Capture Process Conditions on Adsorptive Performance of 3D-Printed Aminosilica Monoliths

Direct air capture (DAC) is a promising negative carbon technology to extract CO₂ directly from atmosphere. While various sorbent materials have been developed for DAC, they are yet to be tested under realistic process conditions. In our earlier work, we have developed structured sorbents via additive manufacturing and demonstrated their efficacy in selective removal of CO₂ from air. In this present work, we performed a thorough analysis of process performance of 3D-pronted structures comprising of amine-grafted silica monoliths. In particular, 3D printed mesoporous silica monoliths with cell densities of 200, 400, and 600 cpsi graphed with 30 wt% 3-aminopropylsilyl (APS) and tested under temperature swing adsorption (TSA) with various flowrate, desorption temperatures, and feed conditions.¹ The effect of these TSA conditions on several performance metrics including CO₂ purity and recovery, throughput and mass and heat transfer characteristics were investigated systematically to develop a baseline for 3D-printed adsorbent contactors that will be used in DAC processes. Lastly, the energy cost of the TSA system was calculated to provide a cost analysis of the TSA system and the potential scale-up cost of the primary amines DAC adsorbent.